[GRASSLIST:5217] how to exit r.mapcalc ?

[ray hartman]

Gents:

I'm new to GRASS5 ... working thru some examples. Lots of stuff works, 
but I can't seem to get any output from the r.mapcalc "function". For 
examples: ADDING or MULTIPLYING two raster maps.
It might help to know  "white-space" rules for simple operations, and 
how to LEAVE r.mapcalc without crashing the function.Neither the <man> 
pages nor the Leics tutorial seems to explicitly mention these basic 
typography.

ray hartman